The **Ability** module provides all level-2 module APIs for developers to export.
> **NOTE**
>
> The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version.
> The APIs of this module can be used only in the FA model.
Want is a carrier for information transfer between objects (application components). Want can be used as a parameter of **startAbility** to specify a startup target and information that needs to be carried during startup, for example, **bundleName** and **abilityName**, which respectively indicate the bundle name of the target ability and the ability name in the bundle. When ability A needs to start ability B and transfer some data to ability B, it can use Want a carrier to transfer the data.
> **NOTE**
>
> The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version.
| deviceId | string | No | ID of the device running the ability. |
| bundleName | string | No | Bundle name of the ability. If both **bundleName** and **abilityName** are specified in a **Want** object, the **Want** object can match a specific ability.|
| abilityName | string | No | Name of the ability. If both **bundleName** and **abilityName** are specified in a **Want** object, the **Want** object can match a specific ability. The value of **abilityName** must be unique in an application.|
| uri | string | No | URI information to match. If **uri** is specified in a **Want** object, the **Want** object will match the specified URI information, including **scheme**, **schemeSpecificPart**, **authority**, and **path**.|
| type | string | No | MIME type, that is, the type of the file to open, for example, **text/xml** and **image/***. For details about the MIME type definition, see https://www.iana.org/assignments/media-types/media-types.xhtml?utm_source=ld246.com. |
| flags | number | No | How the **Want** object will be handled. By default, numbers are passed in. For details, see [flags](js-apis-ability-wantConstant.md#wantConstant.Flags).|
| action | string | No | Action to take, such as viewing and sharing application details. In implicit Want, you can define this field and use it together with **uri** or **parameters** to specify the operation to be performed on the data. |
| parameters | {[key: string]: any} | No | Want parameters in the form of custom key-value (KV) pairs. By default, the following keys are carried:<br>**ohos.aafwk.callerPid**: PID of the caller.<br>**ohos.aafwk.param.callerToken**: token of the caller.<br>**ohos.aafwk.param.callerUid**: UID in [bundleInfo](js-apis-bundle-BundleInfo.md#bundleinfo-1), that is, the application UID in the bundle information. |
| entities | Array\<string> | No | Additional category information (such as browser and video player) of the target ability. It is a supplement to **action** in implicit Want and is used to filter ability types. |
| moduleName | string | No | Module to which the ability belongs.|
**Example**
- Basic usage
```ts
varwant={
"deviceId":"",// An empty deviceId indicates the local device.
"bundleName":"com.extreme.test",
"abilityName":"MainAbility",
"moduleName":"entry"// moduleName is optional.
};
this.context.startAbility(want,(error)=>{
// Start an ability explicitly. The bundleName, abilityName, and moduleName parameters work together to uniquely identify an ability.
console.log("error.code = "+error.code)
})
```
- Data is transferred through user-defined fields. The following data types are supported:
The **Configuration** module defines environment change information.
> **NOTE**
>
> The initial APIs of this module are supported since API version 8. Newly added APIs will be marked with a superscript to indicate their earliest API version.
> This module is deprecated since API version 9. You are advised to use [@ohos.application.Configuration](js-apis-app-ability-configuration.md) instead.
| language<sup>8+</sup> | string | Yes| Yes| Language of the application.|
| colorMode<sup>8+</sup> | [ColorMode](js-apis-application-configurationConstant.md#configurationconstantcolormode) | Yes| Yes| Color mode, which can be **COLOR_MODE_LIGHT** or **COLOR_MODE_DARK**. The default value is **COLOR_MODE_LIGHT**.|
| direction<sup>9+</sup> | [Direction](js-apis-application-configurationConstant.md#configurationconstantdirection9) | Yes| No| Screen orientation, which can be **DIRECTION_HORIZONTAL** or **DIRECTION_VERTICAL**.|
| screenDensity<sup>9+</sup> | [ScreenDensity](js-apis-application-configurationConstant.md#configurationconstantscreendensity9) | Yes| No| Screen resolution, which can be **SCREEN_DENSITY_SDPI** (120), **SCREEN_DENSITY_MDPI** (160), **SCREEN_DENSITY_LDPI** (240), **SCREEN_DENSITY_XLDPI** (320), **SCREEN_DENSITY_XXLDPI** (480), or **SCREEN_DENSITY_XXXLDPI** (640).|
| displayId<sup>9+</sup> | number | Yes| No| ID of the display where the application is located.|
| hasPointerDevice<sup>9+</sup> | boolean | Yes| No| Whether a pointer device, such as a keyboard, mouse, or touchpad, is connected.|
For details about the fields, see the **ohos.application.Configuration.d.ts** file.
The **ConfigurationConstant** module provides the enumerated values of the environment configuration information.
> **NOTE**
>
> The APIs of this module are supported since API version 8 and deprecated since API version 9. You are advised to use [@ohos.application.ConfigurationConstant](js-apis-app-ability-configurationConstant.md) instead. Newly added APIs will be marked with a superscript to indicate their earliest API version.
The **AbilityResult** module defines the result code and data returned when an ability is started or destroyed.
> **NOTE**
>
> The initial APIs of this module are supported since API version 7. Newly added APIs will be marked with a superscript to indicate their earliest API version.
